I had mine narrowed down to a few situations....low blood sugar due to not eating, flourescent lighting would set them off, bright glare off bumpers or glass...also snow blindness would do it. My eyes are super light sensitive so I can't read in dim light.....need lots of light. I have 20/10 vision so I think my focus is quite extreme. Stress was also a factor at times....as I said I got them the worst when I was married to that friggin......whoops, sorry....you know!
Yeah when you get the pre-symptoms and you are out....man you can't run for home quick enough....especially when you have to drive!
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